If you need to create multiple objects of the same type, object literals (`{ property:'value'}`) can be inefficient. We can create constructor functions, which act like class declarations.
```javascript
var Person = function(){
this.numArms = 2; //use the this keyword to create properties and methods
this.numLegs = 2;
}
var me = new Person(); //use the new keyword to instantiate a new object
var someoneElse = new Person();
console.log(me);
console.log(someoneElse);
```
We can pass parameters into constructor functions to make instances unique
```javascript
var Person = function(name){
this.name = name;
this.numArms = 2; //use the this keyword to create properties and methods
this.numLegs = 2;
}
var me = new Person('Matt'); //use the new keyword to instantiate a new object
var someoneElse = new Person('Joey Jo-Jo Junior Shabadoo');
console.log(me);
console.log(someoneElse);
```
Methods act just like adding properties
```javascript
var Person = function(name){
this.name = name;
this.numArms = 2; //use the this keyword to create properties and methods
this.numLegs = 2;
this.sayHello = function(){
console.log("Hello, my name is " + this.name);
}
}
var me = new Person('Matt'); //use the new keyword to instantiate a new object
me.sayHello();
```
Since functions are objects, we can create static properties/methods (properties and methods that relate to the class, not the instances of the class) by using dot notation
